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/*
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 * SSA/ASS common funtions
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 * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avcodec.h"
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#include "ass.h"
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#include "libavutil/avstring.h"
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/**
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 * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
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 *
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 * @param avctx pointer to the AVCodecContext
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 * @param font name of the default font face to use
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 * @param font_size default font size to use
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 * @param color default text color to use (ABGR)
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 * @param back_color default background color to use (ABGR)
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 * @param bold 1 for bold text, 0 for normal text
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 * @param italic 1 for italic text, 0 for normal text
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 * @param underline 1 for underline text, 0 for normal text
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 * @param alignment position of the text (left, center, top...), defined after
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 *                  the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
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 * @return >= 0 on success otherwise an error code <0
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 */
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static int ff_ass_subtitle_header(AVCodecContext *avctx,
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                                  const char *font, int font_size,
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                                  int color, int back_color,
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                                  int bold, int italic, int underline,
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                                  int alignment)
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{
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    char header[512];
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    snprintf(header, sizeof(header),
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             "[Script Info]\r\n"
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             "ScriptType: v4.00+\r\n"
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             "\r\n"
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             "[V4+ Styles]\r\n"
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             "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
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             "Style: Default,%s,%d,&H%x,&H%x,&H%x,&H%x,%d,%d,%d,1,1,0,%d,10,10,10,0,0\r\n"
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             "\r\n"
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             "[Events]\r\n"
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             "Format: Layer, Start, End, Text\r\n",
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             font, font_size, color, color, back_color, back_color,
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             -bold, -italic, -underline, alignment);
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    avctx->subtitle_header = av_strdup(header);
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    if (!avctx->subtitle_header)
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        return AVERROR(ENOMEM);
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    avctx->subtitle_header_size = strlen(avctx->subtitle_header);
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    return 0;
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}
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int ff_ass_subtitle_header_default(AVCodecContext *avctx)
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{
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    return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
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                                         ASS_DEFAULT_FONT_SIZE,
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                                         ASS_DEFAULT_COLOR,
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                                         ASS_DEFAULT_BACK_COLOR,
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                                         ASS_DEFAULT_BOLD,
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                                         ASS_DEFAULT_ITALIC,
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                                         ASS_DEFAULT_UNDERLINE,
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                                         ASS_DEFAULT_ALIGNMENT);
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}
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void ff_ass_init(AVSubtitle *sub)
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{
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    memset(sub, 0, sizeof(*sub));
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}
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static int ts_to_string(char *str, int strlen, int ts)
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{
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    int h, m, s;
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    h = ts/360000;  ts -= 360000*h;
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    m = ts/  6000;  ts -=   6000*m;
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    s = ts/   100;  ts -=    100*s;
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    return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
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}
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int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
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                    int ts_start, int ts_end, int raw)
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{
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    int len = 0, dlen, duration = ts_end - ts_start;
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    char s_start[16], s_end[16], header[48] = {0};
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    AVSubtitleRect **rects;
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    if (!raw) {
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        ts_to_string(s_start, sizeof(s_start), ts_start);
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        ts_to_string(s_end,   sizeof(s_end),   ts_end  );
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        len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
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                       s_start, s_end);
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    }
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    dlen = strcspn(dialog, "\n");
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    dlen += dialog[dlen] == '\n';
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    rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
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    if (!rects)
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        return AVERROR(ENOMEM);
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    sub->rects = rects;
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    sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
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    rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
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    rects[sub->num_rects]->type = SUBTITLE_ASS;
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    rects[sub->num_rects]->ass  = av_malloc(len + dlen + 1);
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    strcpy (rects[sub->num_rects]->ass      , header);
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    av_strlcpy(rects[sub->num_rects]->ass + len, dialog, dlen + 1);
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    sub->num_rects++;
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    return dlen;
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}